The Cape and Islands District Attorney's Office is investigating after a Chatham police cruiser ran over and killed a college lacrosse player who was lying on an unlit road early on Thursday, authorities said.

Garrett Gagne, 22, of Longmeadow, was lying in the road at about 4 a.m. when he was struck by a Chatham police car responding to an emergency call, police said in a statement.

Gagne, a senior at St. Lawrence University in Canton, New York, was taken to Cape Cod Hospital where was later pronounced dead.

It said the incident was under investigation and it was not known why Gagne was in the road or his condition.